[libcxx-commits] [libcxx] [libcxx][ci] In picolib build, ask clang for the normalised triple (PR #90722)

[David Spickett via libcxx-commits]

DavidSpickett wrote:

And if anyone is brave enough to build with gcc:
```
$ gcc --print-target-triple
gcc: error: unrecognized command line option ‘--print-target-triple’
```
At least they will be pointed right to the line they need to hack to make it work.

https://github.com/llvm/llvm-project/pull/90722